Here is an advertisement from the Menasha Press in 1872, listing the fare for a round trip from Menasha to Milwaukee aboard the M&N.
This clipping was found in the local history files at the Menasha Public Library.
According to some internet references, that ticket, which cost $6 in 1872, would cost between $122-126 today.
Why would someone pay that much to go to Milwaukee and back? Possibly because there were only two (much slower) alternatives at the time, walk, or ride a horse (or some horse-drawn conveyance).